"I've been very impressed by the comments she's given so far on a host of issues," de Blasio said at an unrelated event in the Bronx, ticking off Clinton's recent speeches on voting rights, criminal justice and immigration. "What I am waiting to hear about is the fight against income inequality, how we raise wages and benefits, how we create the progressive taxation system we need."

The mayor also complimented a competitor for the Democratic nomination on Clinton's left.

"I've always liked what I've heard from Bernie Sanders," he said, calling the Vermont senator a "great voice for a fairer society and a fairer economy."